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Appendix A-Sampling and Analysis Plan BSK Project E19-016-01F <br /> Stockton Metropolitan Airport(SCK) March 1, 2023 <br /> Stockton, California Page 11 <br /> 5. FIELD QUALITY CONTROL SAMPLES <br /> Field quality control samples will consist of duplicate samples,trip blanks,equipment rinsate samples(i.e., <br /> equipment blank), and field blanks. Quality control samples will be water samples analyzed for PFAS only. <br /> No quality control soil samples will be collected. <br /> 5.1 Duplicate Samples <br /> Sample duplicates will be collected to document the precision of the sampling process. One duplicate <br /> groundwater sample will be collected per boring when collecting groundwater samples for chemical <br /> analysis. Duplicate samples will be given a unique sample identification but will receive the same <br /> sampling time as the main sample. The duplicate sample identification will be recorded on the well <br /> sample logs. <br /> 5.2 Trip Blanks <br /> Trip blanks will be used to document contamination attributable to sample transport and field handling <br /> procedures. Trip blanks will be provided by the laboratory by filling a sample container will reagent water <br /> and storing it with the sample bottles. During sampling activities,the trip blank will be transferred to the <br /> cooler after the first sample of the day is collected. Trip blanks should be prepared at a frequency of one <br /> per day of groundwater sampling. <br /> 5.3 Equipment Rinsate Samples <br /> Equipment rinsate samples will be used to document proper cleansing of non-disposable sampling <br /> equipment. One rinsate sample will be collected per day of groundwater sampling where a groundwater <br /> sample was collected for chemical analysis. Equipment blank samples would be collected at the end of <br /> the day. Equipment rinsate samples will be obtained by running laboratory provided reagent water <br /> through or over the cleansed sample collected equipment. Reagent water will be collected into the <br /> sample bottle and sealed. The sample will be bagged and placed inside the ice chest. <br /> 5.4 Field Blanks <br /> A field blank will be analyzed to assess the potential for PFAS from the ambient environment being <br /> introduced during the sampling activities. One field blank sample will be collected per day of groundwater <br /> sampling where a groundwater sample was collected for chemical analysis. Afield blank must be stored <br /> in the ice chest used to store and transport samples. The field blank procedure is as follows:At the sample <br /> point, the sample personnel must open the field blank sample bottle, pour the reagent water into the <br /> sample bottle and seal. The sample will be bagged and placed inside the ice chest. The empty container <br /> that contained the field reagent water must also be returned to the laboratory. <br /> a <br />